Analogies are anatomical features that have the same form or function in different species that have no known common ancestor. For instance, the wings of a bird and a butterfly are analogous structures because they are superficially similar in shape and function.omologies are anatomical features, of different organisms, that have a similar appearance or function because they were inherited from a common ancestor that also had them.
Complexometric titration (sometimes chelatometry) is a form of volumetric analysis in which the formation of a colored complex is used to indicate the end point of a titration. Complexometric titrations are particularly useful for the determination of a mixture of different metal ions in solution.An indicator capable of producing an unambiguous color change is usually used to detect the end-point of the titration.DTA forms an octahedral complex with most 2+ metal cations, M 2+ , in aqueous solution. The main reason that EDTA is used so extensively in the standardization of metal cation solutions is that the formation constant for most metal cation-EDTA complexes is very high, meaning that the equilibrium for the reaction:
A titration is a process used to determine the volume of a solution needed to react with a given amount of another substance. For example, when a hydrochloric acid solution is titrated with a sodium hydroxide solution, the pH of the acidic solution is initially low. As the base is added, the change in pH is quite gradual until close to the equivalence point, where equimolar amounts of acid and base have been mixed.